diff --git a/compiler-rt/lib/fuzzer/FuzzerTracePC.h b/compiler-rt/lib/fuzzer/FuzzerTracePC.h
--- a/compiler-rt/lib/fuzzer/FuzzerTracePC.h
+++ b/compiler-rt/lib/fuzzer/FuzzerTracePC.h
@@ -193,7 +193,7 @@
       Handle8bitCounter(FirstFeature, P - Begin, V);
 
   // Iterate by Step bytes at a time.
-  for (; P < End; P += Step)
+  for (; P + Step <= End; P += Step)
     if (LargeType Bundle = *reinterpret_cast<const LargeType *>(P)) {
       Bundle = HostToLE(Bundle);
       for (size_t I = 0; I < Step; I++, Bundle >>= 8)